A <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> comprises a <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> and a <span class="c25 g0">closingspan> <span class="c26 g0">platespan>. The <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> extends in its <span class="c10 g0">longitudinalspan> <span class="c17 g0">axisspan> in the <span class="c5 g0">vehiclespan> <span class="c6 g0">transversespan> <span class="c7 g0">directionspan> (y <span class="c7 g0">directionspan>) and is open in the <span class="c4 g0">travelspan> <span class="c7 g0">directionspan> (x <span class="c7 g0">directionspan>). The <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> comprises an <span class="c30 g0">upperspan> <span class="c12 g0">legspan>, a <span class="c9 g0">lowerspan> <span class="c12 g0">legspan> and a web connecting the legs, and thus providing a <span class="c21 g0">chamberspan>. The <span class="c25 g0">closingspan> <span class="c26 g0">platespan> is attached to the <span class="c30 g0">upperspan> and <span class="c9 g0">lowerspan> legs. At least one <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> or a <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> <span class="c2 g0">assemblyspan> comprising such a <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> is installed in the <span class="c20 g0">profilespan> <span class="c21 g0">chamberspan>, wherein the <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> comprises, on each of its ends facing in the <span class="c20 g0">profilespan> <span class="c10 g0">longitudinalspan> <span class="c7 g0">directionspan>, a <span class="c12 g0">legspan> <span class="c13 g0">angledspan> in the <span class="c7 g0">directionspan> toward the web of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> and ending with spacing to the web.
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5. A <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> comprising:
a <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> with a <span class="c10 g0">longitudinalspan> <span class="c11 g0">extensionspan> which extends in its <span class="c10 g0">longitudinalspan> <span class="c17 g0">axisspan> in a <span class="c5 g0">vehiclespan> <span class="c6 g0">transversespan> <span class="c7 g0">directionspan> (y <span class="c7 g0">directionspan>), wherein the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> comprises an <span class="c30 g0">upperspan> <span class="c12 g0">legspan>, a <span class="c9 g0">lowerspan> <span class="c12 g0">legspan>, and a web connecting the legs and thus providing a <span class="c20 g0">profilespan> <span class="c21 g0">chamberspan> with a <span class="c20 g0">profilespan> opening open in a <span class="c4 g0">travelspan> <span class="c7 g0">directionspan> (x <span class="c7 g0">directionspan>);
a <span class="c25 g0">closingspan> <span class="c26 g0">platespan> which spans the <span class="c20 g0">profilespan> opening in a <span class="c3 g0">verticalspan> <span class="c7 g0">directionspan> (z <span class="c7 g0">directionspan>) and extends over at least a portion of the <span class="c10 g0">longitudinalspan> <span class="c11 g0">extensionspan> of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan>, wherein the <span class="c25 g0">closingspan> <span class="c26 g0">platespan> is attached to the <span class="c30 g0">upperspan> and <span class="c9 g0">lowerspan> legs of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan>; and
a <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> <span class="c2 g0">assemblyspan> comprising a <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> installed in the <span class="c20 g0">profilespan> <span class="c21 g0">chamberspan>, wherein the <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> comprises a <span class="c18 g0">longspan> <span class="c17 g0">axisspan> extending in the <span class="c10 g0">longitudinalspan> <span class="c11 g0">extensionspan> of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> and a <span class="c14 g0">shortspan> <span class="c17 g0">axisspan> extending in the <span class="c3 g0">verticalspan> <span class="c7 g0">directionspan>, with the <span class="c14 g0">shortspan> <span class="c17 g0">axisspan> being multiple times shorter than the <span class="c18 g0">longspan> <span class="c17 g0">axisspan>;
wherein the <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> <span class="c2 g0">assemblyspan> is attached to a side of the <span class="c25 g0">closingspan> <span class="c26 g0">platespan> facing toward the <span class="c20 g0">profilespan> opening and extends into the <span class="c20 g0">profilespan> <span class="c21 g0">chamberspan> of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan>;
wherein the <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> comprises, on each of its ends facing in the <span class="c20 g0">profilespan> <span class="c10 g0">longitudinalspan> <span class="c7 g0">directionspan>, a <span class="c12 g0">legspan> <span class="c13 g0">angledspan> in the <span class="c7 g0">directionspan> toward the web of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> and ending with spacing to the web.
1. A <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> comprising:
a <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> with a <span class="c10 g0">longitudinalspan> <span class="c11 g0">extensionspan> which extends in its <span class="c10 g0">longitudinalspan> <span class="c17 g0">axisspan> in a <span class="c5 g0">vehiclespan> <span class="c6 g0">transversespan> <span class="c7 g0">directionspan> (y <span class="c7 g0">directionspan>), wherein the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> comprises an <span class="c30 g0">upperspan> <span class="c12 g0">legspan>, a <span class="c9 g0">lowerspan> <span class="c12 g0">legspan>, and a web connecting the legs and thus providing a <span class="c20 g0">profilespan> <span class="c21 g0">chamberspan> with a <span class="c20 g0">profilespan> opening open in a <span class="c4 g0">travelspan> <span class="c7 g0">directionspan> (x <span class="c7 g0">directionspan>);
a <span class="c25 g0">closingspan> <span class="c26 g0">platespan> which spans the <span class="c20 g0">profilespan> opening in a <span class="c3 g0">verticalspan> <span class="c7 g0">directionspan> (z <span class="c7 g0">directionspan>) and extends over at least a portion of the <span class="c10 g0">longitudinalspan> <span class="c11 g0">extensionspan> of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan>, wherein the <span class="c25 g0">closingspan> <span class="c26 g0">platespan> is attached to the <span class="c30 g0">upperspan> and <span class="c9 g0">lowerspan> legs of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan>; and
at least one <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> installed in the <span class="c20 g0">profilespan> <span class="c21 g0">chamberspan>, wherein the <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> comprises a <span class="c18 g0">longspan> <span class="c17 g0">axisspan> extending in the <span class="c10 g0">longitudinalspan> <span class="c11 g0">extensionspan> of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> and a <span class="c14 g0">shortspan> <span class="c17 g0">axisspan> extending in the <span class="c3 g0">verticalspan> <span class="c7 g0">directionspan>, with the <span class="c14 g0">shortspan> <span class="c17 g0">axisspan> being multiple times shorter than the <span class="c18 g0">longspan> <span class="c17 g0">axisspan>;
wherein an <span class="c30 g0">upperspan> <span class="c31 g0">edgespan> of the <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> facing toward the <span class="c20 g0">profilespan> opening is attached to the <span class="c30 g0">upperspan> <span class="c12 g0">legspan> of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan>, and a <span class="c9 g0">lowerspan> <span class="c31 g0">edgespan> of the <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> facing toward the <span class="c20 g0">profilespan> opening is attached to the <span class="c9 g0">lowerspan> <span class="c12 g0">legspan> of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan>;
wherein the <span class="c0 g0">reinforcingspan> <span class="c1 g0">elementspan> comprises, on each of its ends facing in the <span class="c20 g0">profilespan> <span class="c10 g0">longitudinalspan> <span class="c7 g0">directionspan>, a <span class="c12 g0">legspan> <span class="c13 g0">angledspan> in the <span class="c7 g0">directionspan> toward the web of the <span class="c8 g0">beamspan> <span class="c20 g0">profilespan> and ending with spacing to the web.
2. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
3. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
4. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
6. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
7. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
8. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
9. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
10. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
11. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
12. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
13. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
14. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
15. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
16. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
17. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
18. The <span class="c15 g0">bumperspan> <span class="c16 g0">crossbeamspan> of
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The present disclosure relates to a bumper crossbeam having a beam profile, which extends in its longitudinal axis in the vehicle transverse direction (y direction) and is open in the travel direction (x direction), comprises an upper leg, a lower leg, and a web connecting the legs and thus provides a chamber, and having a closing plate, which spans the profile opening in the vertical direction (z direction) and extends over at least a portion in the longitudinal extension thereof and is attached to the upper and lower legs.
Bumper crossbeams are arranged in motor vehicles on the front and/or rear. Bumper crossbeams comprise a beam profile, which is typically formed hat-shaped in its cross section and is fastened on the vehicle side. The profiling is formed by an upper leg, a lower leg, and a web connecting the two legs, which can also be referred to as the back of the profile. The beam profile is open in the travel direction and therefore typically has an open profile chamber which is typically profiled approximately U-shaped in cross section and is open in the travel direction. The web connecting the legs faces toward the vehicle. The beam profile is fastened on the vehicle side with crash boxes interposed. The two legs of the beam profile enclosing the profile chamber have angled flanges facing away from the profile chamber in the vertical direction (y direction) at the ends thereof. A closing plate for the frontal closing of the profile chamber is fastened thereon. The closing plate attached to the flanges of the legs of the beam profile is also used to reinforce the beam profile, since a box profile is provided in this way in the region of the closing plate. Such a design prevents the one or the other leg of the beam profile from being displaced in relation to the other leg in the event of an impact to be absorbed. In some designs, the closing plate extends over the entire or almost the entire longitudinal extension of the beam profile.
The rigidity of such a bumper crossbeam is substantially set by the depth of the profiling of the beam profile. The depth of a bumper crossbeam and thus its extension in the vehicle longitudinal direction (x direction) is generally restricted. This is to be taken into consideration in the dimensioning of the profile depth of the beam profile in conjunction with the design of the bumper crossbeam. In some cases, however, this is not sufficient to provide the bumper crossbeam with the desired rigidity. It has been proposed in WO 2016/163054 A1, to provide a remedy at this point, that a reinforcing element be installed in the profile chamber of the beam profile. This reinforcing element previously known from the prior art is an open or closed reinforcing element conceived as approximately trapezoidal in cross section, which is welded with the base of its shorter trapezoid side to the web of the beam profile connecting the legs. In a design in which the reinforcing element is designed as open, it has legs angled outward in the vertical direction, which are incorporated into the joint between the angled flanges of the legs of the beam profile and the closing plate. The equipment element is located in the middle in relation to the beam profile and extends over only a short portion in relation to the longitudinal extension of the beam profile.
Although an improvement of the crash behavior of the bumper crossbeam in the so-called pole test can be achieved by the installation of such an equipment element, disadvantages nonetheless have to be accepted. These relate, on the one hand, to the required welding of the reinforcing element to the web of the beam profile, which is not unproblematic in particular if the reinforcing element is closed and is thus formed as a hollow chamber profile, because of the lack of accessibility or accessibility only with extreme difficulty of the joining point. The components under discussion of such a bumper crossbeam are often manufactured from a steel plate. To equip these bumper crossbeams with the desired corrosion resistance, they are coated in the course of a cathodic dip coating. Because of the large contact surfaces between the reinforcing element and the beam profile, proper wetting of the entire surface and thus a coating of the above-mentioned type cannot be ensured.
Proceeding from this background, an aspect of the present disclosure is based on refining a bumper crossbeam of the type mentioned at the outset in such a way that, above all, the installation of the reinforcing element into the beam profile of the bumper crossbeam is simplified. Moreover, the bumper crossbeam is to be suitable for a corrosion coating in the course of a cathodic dip coating.
This is achieved by a bumper crossbeam of the type mentioned at the outset, in which at least one reinforcing element or a reinforcing element assembly comprising such a reinforcing element is installed in the profile chamber, which reinforcing element has a long axis extending in the profile longitudinal extension and a short axis extending in the vertical direction, which is multiple times shorter than the long axis. If the reinforcing element is not part of a reinforcing element assembly, the reinforcing element is attached with its upper edge facing toward the profile opening to the upper leg of the beam profile and with its lower edge facing toward the profile opening to the lower leg of the beam profile, or if the reinforcing element is part of the reinforcing element assembly, the reinforcing element assembly is attached to the side of the closing plate facing toward the profile opening and extends into the profile chamber, wherein the reinforcing element comprises, on its ends facing in the profile longitudinal direction, legs each angled in the direction toward the web of the beam profile and ending with spacing to the web.
The direction specifications x direction, y direction, and z direction as used in the context of this disclosure are the directions typically used in this regard in vehicles. The x direction is the direction of the longitudinal extension of the vehicle, the y direction is the direction transverse thereto in the direction of the width of the vehicle. The z direction is the direction in the vertical.
The reinforcing element used in this bumper crossbeam is an elongated component, embodied like a bracket, the longitudinal extension of which follows the longitudinal extension of the beam profile. This reinforcing element is inserted into the profile chamber with its upper edge and its lower edge offset in relation to the terminus of the bumper crossbeam facing in the travel direction and fastened on the upper leg and the lower leg. Welding is suitable for this purpose for the attachment of the reinforcing element to the beam profile, wherein the weld seam does not necessarily have to be continuous, but rather can also be embodied as a stitched seam. The reinforcing element is located set back from the terminus of the beam profile facing in the travel direction, but is located in its vicinity. The reinforcing element has in each case a leg angled in relation to its longitudinal extension on each longitudinal end, wherein the legs typically enclose an angle with the bracket-shaped portion of the reinforcing element such that the legs face in the x direction. The ends of the legs end with spacing to the web of the beam profile. An installation of such a reinforcing element into the profile chamber of a bumper crossbeam is possible without problems, since the joint is readily accessible from the side of the profile opening of the beam profile. The reinforcement of the bumper crossbeam effectuated in this manner over the extension of the reinforcing element or reinforcing element assembly results in an improvement of the crash behavior, in particular in the so-called pole test.
It is advantageous that the reinforcing element is produced separately from the beam profile and the closing plate. The reinforcing of the bumper crossbeam effectuated by the reinforcing element can thus be enhanced in a simple manner by corresponding structuring thereof. An improvement of the reinforcing effect can be achieved, for example, in that the reinforcing element is profiled in the vertical direction. This may be achieved by a bead following the longitudinal extension of the reinforcing element and typically extending over the entire longitudinal extension.
These legs are unstructured if the back of the reinforcing element connecting the angled legs is structured in the vertical direction. The angled legs are typically used for an impact energy absorption like a crash element. In the event of an impact, they are pressed in the direction toward the web of the beam profile or, for the case in which the reinforcing element is part of a reinforcing element assembly, toward the further component of the reinforcing element assembly and, if they arrive in contact on the web or a base of a component associated with the reinforcing element assembly as a buttress, are deformed with absorption of energy. If desired, these angled legs of the reinforcing element can comprise energy absorption fold contact structures, such as beads extending in the vertical direction, in the case of such a use.
In one design, in which such a reinforcing element is part of a reinforcing element assembly, it is inserted into a reinforcing profile as a further component of the reinforcing element assembly. This reinforcing profile is also profiled in a U shape having its profile opening facing away from the vehicle with an upper leg, a lower leg, and a web connecting the legs. Although such a reinforcing profile can extend over the entire longitudinal extension in the y direction of the beam profile, it is generally considered to be sufficient if it spans the portion extending between the crash boxes attached to the beam profile. A shorter design of such a reinforcing profile is also entirely possible. The reinforcing element is joined, typically welded, with its upper and lower edge to the inner side of the upper leg or the lower leg, respectively. The reinforcing profile is inserted into the profile chamber of the beam profile, but does not contact the web of the beam profile connecting the two legs with its termination facing toward the vehicle. The cross-sectional profiling of the reinforcing profile can substantially correspond to the cross-sectional profiling of the beam profile. However, this is not absolutely required.
It is of particular interest that such a reinforcing element assembly is attached to the inner side of the closing plate. The fastening of a reinforcing element with respect to the beam profile and thus the bumper crossbeam on the inner side of the closing plate, typically by a weld, is noteworthy because, following the prevailing opinion, it was previously presumed that such reinforcing structural plates would have to be fastened on the beam profile itself. Because of the separate production of the beam profile with its profile chamber and the closing plate having the reinforcing element assembly attached thereon, these parts can readily be subjected to a dip coating, in particular a cathodic dip coating, without it being a concern that specific surface regions will be coated only inadequately or not at all. The approach in this concept is a different one from the approach selected in the prior art. While in previously known reinforcing concepts of beam profiles in bumper crossbeams, the beam profile has specifically been reinforced, since it is the component to be reinforced, such a reinforcing element assembly attached to the closing plate and protruding into the profile chamber does effectuate a certain reinforcement. However, it becomes particularly effective if the reinforcing profile comes into contact with the beam profile in the event of an impact. Reinforcing of the beam profile meeting the requirements thus occurs only or first when it is actually required, specifically in event of an impact.
It is also advantageous in such a design that not only the reinforcement in case of a pole test but also the torsional rigidity is enhanced by the reinforcing profile. It is also advantageous that depending on the vehicle or its design, a reinforcing element assembly adapted to the beam profile with respect to the respective requirements can be installed in the same beam profile. This relates to the design of the reinforcing profile with respect to its structuring and material thickness and also to the reinforcing element itself. With such a modular construction of bumper crossbeams, the same beam profile can thus be used with further components attached thereon, for example, the crash boxes for different vehicles, wherein the specific bumper crossbeam properties can be configured by corresponding selection of the reinforcing element assembly to be installed. This also applies to the closing plate. Differently designed reinforcing element assemblies can be attached on one such closing plate. This also applies to the reinforcing element, even if it is inserted directly into a beam profile.
In a further refinement, it is provided that the chamber formed by the beam profile typically has a constriction formed by a bead-like bulge of the lower leg of the beam profile in its middle region in relation to the longitudinal extension of the beam profile. Such a constriction reducing the height of the profile chamber represents a buckle contact, at which the beam profile buckles upward and thus in the z direction in the event of an impact, if a force having a vectorial component in the z direction is introduced due to an object acting on the bumper crossbeam. The location of such a buckle contact is defined by the constriction. It is typically located in the middle region of the beam profile. Such a design is advantageous if a reinforcing element assembly protrudes into the chamber of the beam profile. The reinforcing element assembly is typically arranged with spacing to the legs of the beam profile in such a design. In case of buckling of the beam profile in the z direction, the reinforcing element assembly is tilted in the chamber in relation to the beam profile. Both elements begin to work against one another, with the result that impact energy is absorbed. In this way, breaking of the beam profile is prevented in the case of the forces applied in the scope of the typical tests.
The description below is provided on the basis of example embodiments with reference to the appended figures, wherein:
With reference to
The reinforcing element assembly 13 comprises the reinforcing element 1.1 and a reinforcing profile 18. The reinforcing profile 18 comprises an essentially U-shaped transverse profiling. It is provided by an upper leg 19, a lower leg 20, and a web 21 connecting the two legs 19, 20. The reinforcing element 1.1 engages with its two legs 3.2, 3.3 in the chamber provided by the profiling of the reinforcing profile 18. The construction of the bumper crossbeam 9 and the arrangement of the reinforcing element assembly 13 inside the profile chamber 12 of the beam profile 10 can be seen from the sectional illustration of
The reinforcing element 1.1 is inserted into the chamber provided by the reinforcing profile 18 and is welded in the region of the upper and lower edge of its back 2.1 to the inner side of the upper and lower legs 19, 20. The weld seam is also embodied as a stitched seam in this design. The weld beads are identified by the reference signs 23, 23.1 in
The reinforcing element assembly 13 adjoins with the end faces of the legs 19, 20 of the reinforcing profile 18 on the inner side of the closing plate 11 and is connected thereto by a weld seam 24, 24.1, respectively. These weld seams can be embodied as continuous or also as a stitched seam.
It is clear from the cross-sectional illustration of
The bumper crossbeam 9 also meets particularly high requirements. In particular, it can absorb higher forces without the beam profile 10 tearing on its side facing toward the vehicle. The reason for this is the reinforcing provided by the reinforcing element assembly 13, which unfolds its full effect in the case of an impact, specifically when the reinforcing profile 18 acts with its outer side against the inner side of the beam profile 10. Moreover, crash structures acting in the x direction, by which impact energy can be dissipated by deformation, are provided by the legs 19, 20 of the reinforcing profile 18 and by the legs 3.2, 3.3 of the reinforcing element 1.1.
The force-distance diagram shown in
The cross section of
If a force component, oriented upward in the z direction, occurs in the event of an impact, the beam profile 10.1 can buckle upward at a defined point, specifically in the region of the vertex of the embossment 25, which in turn results in tilting of the reinforcing element assembly 13.1 inside the profile chamber 12.1. The reinforcing element assembly 13.1 wedges with its reinforcing profile 18.1 against the legs 14.1, 15.1 enclosing the profile chamber 12.1. The buckling, the tilting of the reinforcing element assembly 13 in relation to the beam profile 10.1 and the working against one another thus effectuated of the beam profile 10.1 with the reinforcing profile 18.1 absorb impact energy to a noticeable extent. Therefore, the crash performance is improved once again with such a design.
The invention has been described on the basis of example embodiments. Without departing from the scope of the claims, numerous other possibilities exist for a person skilled in the art to be able to implement the invention, without these having to be specifically described in greater detail in the context of this description.
Lagin, Stephan, Höning, Joachim, Wittkugel, Ulrich
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Mar 09 2020 | WITTKUGEL, ULRICH | KIRCHHOFF AUTOMOTIVE DEUTSCHLAND GMBH | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 052238 | 0653 |
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